code: def create_database(self, db_name="default"):
      connections.connect(host=self.host, port=self.port)
      all_db = db.list_database()
      logger.info(f"all database: {all_db}")
      if db_name not in all_db:
          logger.info(f"create database: {db_name}")
          try:
              db.create_database(db_name=db_name)
          except Exception as e:
              logger.error(e)
  
file_path: milvus/tests/restful_client/base/testbase.py
imports: import json
  import sys
  import pytest
  import time
  from pymilvus import connections, db
  from utils.util_log import test_log
  from api.milvus import VectorClient, CollectionClient
  from utils.utils import get_data_by_payload
label_desc: Use image node_id 5 for calling the TestBase obj's underlying member method code with example usage: obj.create_database(db_name) without return types